[website] Update Debian downloads info

[Jeremy Newman]

Patch looks good. We will also need to update all the other languages 
and put in a redirect for the /downloads/debian page to the regular 
downloads page.

-N

On 07/22/2015 01:43 PM, Rosanne DiMesio wrote:
> Updates the Debian links on the Downloads page to point to packages.debian.org and deletes the obsolete WineHQ Debian downloads page.
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